Hädener, Marianne, Wolfgang Weinmann, and Stefan König. “Assessing Cannabis Consumption Frequency: Is the Quantification of Free and Glucuronidated THCCOOH in Blood the Key? Highlights of Analytical Sciences in Switzerland”. CHIMIA 70, no. 7-8 (August 24, 2016): 554. Accessed April 30, 2025. https://www.chimia.ch/chimia/article/view/2016_554.